Tro ip a tptnvttp



No. 609,346. Patented Aug. I6, lae. T. HEWETT.

WHEEL FDR CHAIN GEARING.

(Application filed Feb. 10, 189B.)

(Nomodel.)

,THE Nonms Pasns co.. HOYO-uma. wAsHxNcToN, n. c,

llivrrirn STATES Erich.

THOMAS HFVETT, OF LONDON, ENGLAND, ASSIGNOR OF ONE-HALF TO THOMAS KERRISON BELLIS, OF SAME PLACE.

WHEEL FOR CHAIN-GEARING.

SPECIFICATION forming part of Letters Patent No. 609,346, dated lAugust 16, 1898.

Application filed February l0, 1898. Serial No. 669,821.- (No model.)

To all whom it may concern:

Be it known that l, THOMAS HEWETT, mechanical engineer, a subject of the Queen of Great Britain, residing at 6 Jeffreys Square, St. Mary Axe, in the city of London, England, have invented certain new and useful Improvements in Wheels for Chain-Gearing, (for which I obtained Letters Patent in Great Britain on the 23d day of July, 1897, numbered 17,37 9,) of which the following is a specification.

This invention relates to an improved construction of wheels for chain-gearing, such gearing being applicable as the driving-gear of bicycles and othervelocipedes and for a variety of other or analogous uses. Y

My improved chain-wheel I construct of two metal disks suitably shaped and secured fiXedly together for the purpose of carrying series of antifriction-rolls to be engaged by the driving-chain, as will be hereinafter fully described, reference being had to the accompanying drawings.

In the drawings, Figure l shows a side view of a gear-wheel according to the present improvements. Fig. 2 shows a sectional view of the same, taken on the line oc o3 of Fig. l. Fig. 3 shows an edge view of the two half parts of the wheel shown in Figs. l and 2, said half parts being afterward connected to form a wheel. Fig. l shows a sectional view of such wheels, showing the method of fastening the two halves together; and Fig. 5 shows a side view of a portion of the larger or driving wheel, the smaller or driven wheel being shown in Fig. l.

My improved chain-wheel I construct of two metal disks a a, each disk being stamped or formed near its periphery with a shoulder b and then a radial extension c or flange, so that when the two disks are brought side by side and secured fixedly together a wheel is 'formed with a recess or trough-like annular channel d, in which the drive-chain may lie. The disks a a are for lightness and other reasons formed with openings a' o. Some of these openings are arranged to come oppositely disposed ineachpdisk, these openings forming a series of clear spaces in the peripheral channel-bed cl for the escape of mud. These parts may be accurately produced by the aid of suitable-dies and presses.

The disk portion a of the wheel is provided with openings at, which receive corresponding projections 705 (see Fig. 4) from a ring h5, said projections being4 riveted over at their outer ends to firmly hold the two halves of the wheel together. The collar 71:5 is interiorly threaded and serves as a means whereby to attach the wheel to the driven axis. The interiorly-threaded portion of the collar b5 registers with the edges of the central apertures a3 of the disks, which are interiorly threaded also, the threads of said central apertures corresponding with the threads of the collar andforming a continuation thereof.

on its inner face with integral projections eX- tending through the slots in the disks and headed down at their outer ends to firmly bind the disks together, the edges of the said central apertures in the disks being threaded and forming a continuation of the threads of the collar, substantially as described. 1

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

THOMAS HEWETT.

Witnesses:

ALFRED GEORGE BRooKEs, ERNEST JOHN HILL. 

